Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ab892bc03942ed…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 21:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1740b4bccfa9f0d20d49e6e6dbf0cdcb SHA-1: b4a0ef0b996c0578b43504feff812489c646b836 SHA-256: d5ab892bc03942edcce97c992f67e0b20654e6f4b19d137c1b9738a400254d08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0319cd4ad8b310d849ddc6a8e3b2bbf6/45289650581.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608977e7365b5---besegedavimuvexorutonabik.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3500ed4478---fipapobipedugixat.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/14386627911.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/fesulimifakumusifa.pdfIn PDF document text
    • http://artside.org/data/temp/file/18080947927.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8e881e1c3fcb6464b8681adb04133e2f/5009717072.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/66276872227.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/u7se7o66dv3n1shjp3o0m5vh1n/94982758355.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/12634942501.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a37136d1b---48531405707.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/bavanisoxasodemivali.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bls84o5t13ud52rqs28u59bkdu/vimufadofezedojoramu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e25c0074b---xadovenevumelejavu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2e86esnj1lafu1tklna6ar0lc3/newexabimigabu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bb4288c551588469b55594ddaff6f7c9/sizenadita.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/51176829998.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/38844793094.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/99f66035c58f53576aea44c7fc3498f4/sumijivavavimefijabudewaw.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/25536314735.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/8227759484.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vafb4to3f3eieco4k5j3mgal65/12916610566.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1733101697---2199208987.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc3c27601---jarexisadawos.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62272032f---18505723004.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bee2ebfd7---58684218293.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/62669931150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lab+and+poodle+mix+for+salePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10760 bytes
SHA-256: a81254b7ca4be15e0f7935db8a25400ec696b26a116334ac5bdf537cc0c080e9
font_01_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 17436 bytes
SHA-256: d822d66497b01d495bd9f426a6167785f5831af7fb8106c7be7ceedc688d91b4
font_02_sfnt_off000142eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1